Pull-socket for electric switches.



v F. BARR. PULL SOCKET FOB ELEGTRIG SWITCHES.

APPLICATION FILED x0112, 1909.

958,988. Patented. May 24, 1910.

Fi BARB.

PULL SOCKET FOR ELECTRIC SWITCHES.

APPLICATION nun) NOV. 12, 1909.

958,988. Patented May 24,191@..

2 sums-81mm 2.

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FREDERIC BARR, OF NEW YORK, N. Y.

PULL-SOCKET FGR ELECTRIC SWITCHES.

To all whom it may concern:

Be it known that I, Fnnonnrc BARR, a c1t1- Zen of the United States, residing at .362 Livingston street, borough of (Queens, city of New York, State of New York, have invented certain new and useful Improvements in Pull-Sockets for Electric Switches, fully described and represented in the tollowing specification and the accompanying drawings, forming a part of the same.

This invention relates to pull-switches tor the sockets 0t Edison incandescent lamps, and it consists of various details of construc tion which will be understood I from the drawing and the following description.

Figure l is an elevation of the socket; Fig. 2 a vertical section, where hatched, on line 22 in Fig. 7; Fig. 3 is an edge view of all the movable parts of the contactmechanism; Fig. 4 shows the upper side or the insulating disk and the cord-lever; Fig. 5 shows the tinder side of the same with the switch contact-leaves; Fig. 6 is an edge view of the insulating disk with all the parts that are attached thereto and movable therewith; F 7 is a perspective view of one of the switch-springs, and Fig. 8 shows the under side of the ring 9 carrying the sprlngleaves g, Fig. 9 shows the upper side pt the porcelain bed carrying the said stationary switch contact-springs; Fig. 10 shows the under side of the bed with the electrical con nections for the shank of the lamp; Fig 11 shows the top of the porcelain head-piece and the casing; Fig. 12 is a plan of part of the casing where the eyelet is fitted thereto; Fig. 13 shows the under side of the porcelain head-piece; Fig. 14 is a perspective view of the spindle and its attached ratchetdisk; Fig. 15 is a perspective view of the insulating-disk h, Fig. 16 is a perspective view of the porcelain bed-piece B.

A designates screw-shell of the socket into which the shank of the lamp is screwed; B the porcelain bed to which the same is at tached by flanges C and screw D, whlch screw is engaged with the foot of a post E having a direct connection by a screw I with one otthe circuit conductors D. (Fig. 10.)

The under side of the bed B is provided with a seat F which is raised above the.

Specification of Letters Patent.

Application filed November 12, 1909.

Patented May 2st, 1910.

Serial No. 527,614.

flanges G and screw D to keep the lamp shank from contact therewith, and a recess G is formed in one end of such seat to receive the foot of a spring-tongue forming a central lamp contact H which extends over the middle of the seat to press elastically on the center contact on the shank of the lamp.

The upper side of the bed B, as shown in Fig. 9, is formed with two recesses a in which the feet 0- of segmental switch-springs c, c, are titted and secured by screws (Z, d. The head of the screw (Z presses upon the foot of the spring-tongue H, thus making an electric connection between such tongue and the switch-spring c.

The upper side of the porcelain bed is provided with a raised boss c having two segmental porcelain seats f at opposite sides intermediate to the segments of the springs c, 0. Segmental recesses c are formed beneath the segmental springs c, c, to permit of their depression, when pressed by the movable contact leaves.

The foot of a post E is clamped beneath the foot of the spring 0 and provided with the screw I for connection to one of the circuit conductors D. A post E is fitted to a recess upon the bed-piece B at 90 degrees from the post E, and has a screw 1 to clamp the conductor D. The posts sustain a porcelain head-piece B which is clamped to the tops of the posts by screws B hen the lamp is in the screw-shell A, an electrical connection of the springs c and c closes the circuit between the posts E and E through the shell A and the springtongue H, and such electrical connection is furnished bv leaf-springs 9 attached to an insulating disk 7b. The spring-leaves are formed integral with a sheet-metal ring 9,

by cutting them out therewith in the form indicated by the dotted lines at the right hand side of Fig. Each leaf is thus attached to the ring g by a foot or stem 9, and is refiexed over such ring, as shown in Fig, 6; which forms a very elastic construction. The sheet-metal ring is also formed as shown in Fig. 8 with two integral prongs g which are provided to be bent at right angles to the plane of the ring and inserted through slots 2' in the disk it as shown in Fig. 15, their ends being clenched upon the upper side of the disk and thus holding the ring and leaf-springs g firmly to the disk, as shown in Figs. 2 and l. The disk is formed as shown in Figs. 5 and 15 with a square hole in the center, and a spindle is formed as shown in Fig. 2 with a square body to fit such hole, and pivots Z and m upon its lower and upper ends.

The bed-piece B is provided with a step bearing Z for the pivot Z and the head-piece B with a rotatable bearing m for the pivot m. A ratchet-disk n having four radial slits, with the adjacent edges 17?, n, bent downwardly and upwardly (as shown in Fig. 6), is attached rigidly to the spindle at the upper end of the square body 70, see Fig. 7, and the insulating disk is fitted to the spindle body just beneath this disk and has four shouldered indentations 71, in its upper surface to receive the downwardly bent tongues 71/ upon the ratchet-disk. The said tongues contact with the shoulders h and propel the disk It positively when the ratchet-disk is oscillated; thus avoiding any wear of the hole in the disk It. The disk It has the leaf-springs 9 extended from its lower side sufficiently to contact with the segmental switch-springs 0, 0, when the pivot Z of the spindle is fitted in the socket Z within the boss 6. The means for intermitingly moving the disk to bring the spring-leaves 9 over the switch-springs c, 0, consists of the so-called cord-lever formed of sheet-metal integral with a toothed disk 0 which is fitted movably to the pivot m and lies upon the top of the ratchetdisk n. The toothed disk 0 has four teeth or tongues 0 bent downwardly to engage the upwardly bent tongues n upon the ratchetdisk n, and has the cord-lever connected to it by integral arms 79 which have an integral segment 9 at their outer ends. The space p between the arms and the segment 9 is stamped out into a flange 1" which is folded downwardly and outwardly (as shown in Figs. 2, 3 and 4) to form a channel in which a cord .9 may be fitted. The metal at one end of the leaf 1" is formed with a pointed tongue 1" to clamp the end of the cord 8 in the channel which is formed by the bent leaf, and the cord is extended through an eyelet in the casing J of the lamp-socket to operate the switch as is usual. The shoulders at the ends 9 of the segment 9 are adapted to contact with porcelain lugs 14 on the head B next to the posts E and E in opposite positions of the toothed-disk 0, one of the shoulders 9 being held normally against the lugs 1Z2 next to the post E by a spiral spring having coils t fitted to the pivot m and having one of its ends 14 extended into contact with the shoulder q, and the other end 20 bent upwardly and fitted to a hole in the bearing m. The lugs a prevent the cordlever from touching the posts and causing a short circuit.

The pull-cord is guided in its pulling movements by the flanged eyelet t which is fitted loosely to a slot 25 in the upper end of the casing J, the casing having the usual cap K with cup-flange K which fits over the top of the casing J, and closes the slot t while it also holds the eyelet from displacement in the lower end of the slot. The slot is made of such depth that the eyelet stands in a line with the channel which is in the periphery of the cord-lever below the segmental-plate g.

The porcelain head-piece B is formed as shown in Fig. 11 with a lug t which fits in the upper part of the slot t and thus holds the switch-mechanism in the right relation to the eyelet.

J are insulating shells within the casing. Means is provided for winding up the coils of the spring 25 when the parts are first assembled to give the spring the proper tension. This is effected by rotating the bearing m in the head-piece B, and looking it therein when properly adjusted. A shank is projected upward from the bearing through the top of the head-piece and notched to receive a screwdriver and a square flange m is formed upon the lower end of the bearing and fitted to a shallow square recess in the bottom of the head-piece. The pivot m is of such length as to hold the bearing with the flange m in the square recess when the head-piece is clamped upon the posts by the screws B but a sufficient loosening of the screws B permits the lifting of the head-piece B sufficiently to clear the square flange m upon the bearing, and the bearing may then be turned by a screwdriver and the head-piece then pushed down into contact with the tops of the posts when the spring is properly adjusted, which reengages the flange m with the head-piece and holds the spring as adjusted.

The action of the ratchet-mechanism for turning the spring-leaves alternately into contact and out of contact with the switchsprings c, 0, is well known; the chain 8 operating, when pulled, to turn the insulating-disk a quarter of a revolution, and thus alternately bringing the spring-leaves 9 over the switch-springs 0, 0, or between the same, and thereby operating to light or extinguish the lamp.

The invention consists in the details of construction which secure facility of manufacture and effective operation. The switchsprings c and 0, which make and break the circuit are both of them reflexed from the feet 0 by which they are attached, and thus possess great flexibility which enables them to retain their resilience for a long time in operation, and thus make an equally perfect contact at all times. he spring-segments c are connected with their feet by narrow legs 0", which render the spring-segments more yielding. The retlexing of the leaf-springs 9 over the ring g also makes them more yielding. The formation of the leaf-springs g in one piece with a complete ring of sheetmetal 9 furnishes a very strong and permanent attachment of these leaves to the insulating-disk 7t; while the integral tongues form a very cheap and effective means of securing the ring to the disk.

It is essential that the upwardly projecting tongues or upon the ratchet-disk a should maintain accurately their relation to the leaf-springs g, so as to set the same accurately in the desired positions when the chain is pulled, and the shoulder upon the chain-lever contacts with the post E. Such an accurate adjustment of the ratchetdisk 11- to the leaf-springs g is secured partly by making the insulating-disk h with a square hole j and forming the pivot with a square body 70 to fit such hole and making the ratchet nintegral with the spindle as by riveting or soldering it thereon; also by making the tongues 71- upon the disk n to contact with shoulders h on the insulatingdisk. The formation of the chain-lever in one piece with the ratchet-disk 0 maintains a fixed relation between these parts, while the punching of the sheet-metal out of the space 7) furnishes a flange 1'- of sheet-metal by which a channel is formed to sustain the chain in its operative position, and a prong 1" to lock the end of the chain in such channcl; all these parts being readily and cheaply formed of the same piece of sheet-metal, within the margin of the segment 22.

Having thus set forth the nature of the invention what is claimed herein is:

1. In a pull-switch for a lamp-socket, the combination, with the insulating-bed 13 carrying a screw-shell and central lamp-contact and having a boss 6 with segmental switch-segments at its opposite sides electrically connected as set torth, of a rotatable spindle pivoted upon the boss and having a ratchet-disk attached thereto and provided with downwardly and upwardly projecting tongues 21 and 12?, an insulatingdisk titted to the spindle below the ratchetdisk and having recesses with shoulders 70 to engage the tongues a on the ratchet-disk, the insulatingdisk having upon its under side leaf-springs g mounted at opposite sides of the spindle to contact with the switchsegments, and means for intermittingly turning th ratchetdisk by a pull-cord.

2. In a pull-switch for a lamp-socket, the combination with the insulating-bed B carrying a screw-shell and central lamp-contact and having a boss 6 with recesses at its opposite sides, of the switch-segments having feet secured in the recesses and electrically connected as set forth, and having neck 5 reflexed over the feet and provided respectively with segments adjacent to the opposite sides of the boss, and a pull-cord with means for electrically connecting the segments.

3. In a pull-switch for a lamp-socket, the combination, with the insulating-bed B carrying a screw-shell and central lamp contact and having a boss 6 with svitch-segments (1 c, at its opposite sides electrically connect ed as set forth, of a rotatable spindle having a square body with a ratchet-disk 71 attached to such body and having pivots at its opposite ends, a bearing in the boss to receive the lower pivot of the spindle, an insulatingdislt having a square hole fitted to the square body, the ring g having prongs securing it to the under side of the insulating-disk, and provided at opposite sides of the spindle with the reliexed leaf-springs g to contact with the segments 0, c, and means operated by a pull-cord for intermittingly turning the spindle by means of the ratchet-disk.

4-. In a pull-switch for a lamp-socket, the combination, with an insulating-bed B carrying a screw shell and a central lamp contact and having upon its upper side a central boss with a spindle-bearing fitted therein and switch contacts at opposite sides of the said boss, of a spindle rotatable in the said bearings and having an insulatingdisk secured thereon and provided upon its under side with leafsprings adapted to electrically connect the switch-contacts, a ratchet-disk movable with the spindle, a toothed-disk 0 fitted to turn upon the spindle in contact with the ratchet-disk and having a cord-levcr-segment integrally connected to such toothed-disk by arms with the metal between the arms bent downward and outward into a flange to form a channel for a cord, such flange having a tongue r clamped upon the end of the pull-cord in the channel, and a spring operating to move the tootheddisk in opposition to the cord.

In a pull-switch tor a lamp-socket, the combination, with the insulating-bed B hav ing a central boss with a spindle-bearing fitted therein and having switch-segments at opposite sides of such boss, ofa head-piece B having a rotatably adjustable bearing in the center and posts connecting the headpiece to the bed B, a rotatable spindle fitted to the said bearings and having thereon an insulating-disk with leaf-springs attached to connect the switch-segments, a ratchet-disk secured to the spindle, a toothed-disk fitted in ovably to the spindle to engage the ratchetdisk, a corddever extended from the tootheddisk with cord for moving the same, the rotatable bearing in the head-piece having a locking flange upon such bearing engaging In testimony whereof I have hereunto set a recess in the bottom of the head-piece a my hand in the presence of two subscrlbing l0 spiral spring having lts COllS upon the wltnesses.

spindle and its ends en a 'ed respectively 5 with the cordlever and ivi t h the rotatable FREDERIO BARR bearing, and means for turning the bearing \Vitnesses: to adjust it upon the head-piece when the L. LEE,

head-piece is loosened from its posts. THOMAS S. CRANE. 

